Stardust was a 300-kilogram robotic space probe launched by NASA on February 7, 1999. Its primary mission was to collect dust samples from the coma of comet Wild 2, as well as samples of cosmic dust, and return these to Earth for analysis. It was the first sample return mission of its kind. En route to comet Wild 2, the craft also flew by and studied the asteroid 5535 Annefrank. The primary mission was successfully completed on January 15, 2006, when the sample return capsule returned to Earth.[1...

Other lesser-known units of measurement come from notable figures such as Isaac Asimov, who proposed that the amount of pure beauty required to launch a single ship will be called the "milliHelen", and the amount of pure beauty to sink a single ship is, of course, "-1mH".

Douglas Adams and John Lloyd proposed that the minimum distance at which sheep still look picturesque is about 1.4km, or "1 Sheppey".

There's still arguement between the difference between "buttload" and "buttmess", one predating the metric system, and the other being merely unpleasant.